Principles of Inheritance and Variation Question 192

192. The formation of multivalents at meiosis in a diploid organism is due to

[1998]

(a) inversion

(b) deletion

(c) monosomy

(d) reciprocal translocation

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Answer : d

Hints & Solution

(d) Inversion is a change in chromosomal architecture in which part of the chromosome gets inverted in its position so that the sequence of the genes in the inverted region is reversed. In deletion, a segment of a chromosome breaks and is lost. Monosomy is a type of deletion involving deficiency of one chromosome $(2 n-1)$. In reciprocal translocation, there is a mutual exchange of segments between two non-homologous chromosomes.